A rare case of femoral nerve neurilemmoma in the right iliac fossa, pr
esenting as a firm tumour with local discomfort, is described. Modern
imaging techniques could not differentiate the tumour. At explorative
laparotomy the tumour was identified as a neurilemmoma of the femoral
nerve and enucleated. The diagnosis should be borne in mind in cases o
f retroperitoneal tumours of unclear origin. Inappropriate surgery res
ults in nerve damage and paralysis.